Perhaps you should try some spelling variations:
nam thuoc » nam thu, nha thuoc, cay thuoc
toc sach » hoc sach, doc sach, thuoc sach
nam thuc » am thuc, nam thu, nam tu
so sach » so sanh, bo sach, co sach
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua
x hoi » xa hoi, o hoi, x ho

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (toc sach)) ky nang x hoi. hieu va ((nam thuc) OR (nam thuoc)) va hanh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) or (toc sach)) ky nang x hoi. hieu va ((nam thuc) OR (nam thuoc)) va hanh vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (toc sach)) ky nang x hoi. hieu va ((nam thuc) OR (nam thuoc)) va hanh vi cua tre*.